I will always prefer Google Analytics.
There are advantages to letting Google know how well your site performs on certain keywords.
I've noticed that my keyword traffic relates to performance. I'm nicely rewarded if my keyword gets 19 page views, 10 minutes on site with a 20% bounce rate. Traffic dries up on keywords with 1 page view, 15 seconds on site with an 80% bounce rate.
Google would have a lot harder time tracking this if I did not have GA installed.
I don't know if it's actually true or not but my own stats lead me to believe it is.
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